linux-kernel - Re: [PATCH] gpiolib: extend the critical sections of lookup tables

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Message-ID: <CACRpkdYNA1rkG5wJ0+rAT9g4EyzfbN5VP2a9vuMMk_RD6bMLFA@mail.gmail.com>
Date:   Wed, 20 Sep 2023 12:58:58 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH] gpiolib: extend the critical sections of lookup tables

On Wed, Sep 20, 2023 at 11:33 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> On Wed, 20 Sep 2023 11:12:58 +0200, Linus Walleij
> <linus.walleij@...aro.org> said:
> > On Wed, Sep 20, 2023 at 10:56 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:

> > Can we rename this function gpiod_find_lookup_table_locked()
> > as per precedents in the kernel, to indicate that it needs to be
> > called with a lock held?
> >
>
> I think you mean gpiod_find_lookup_table_unlocked() as with this change it
> will no longer take the lock?

I think the pattern is the one I indicated: *_locked() means the function
is to be called with the appropriate lock held, cf
arch/arm64/kvm/hyp/nvhe/mm.c

pkvm_create_mappings() takes a lock and then calls
pkvm_create_mappings_locked() which even asserts that
the lock is held.

Yours,
Linus Walleij